Semicolon fix (#53)

* add a catch to promise for echo-bot

* semicolon removed on promise for echo bot example

Author: quentinbt

examples/echo-bot/.index.js.swp

@@ -21,7 +21,7 @@ const app = express();
 app.post('/callback', line.middleware(config), (req, res) => {
   Promise
     .all(req.body.events.map(handleEvent))
-    .then((result) => res.json(result));
+    .then((result) => res.json(result))
     .catch((err) => {
       console.error(err);
       res.status(500).end();